package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

public class LoginIntercepter implements HandlerInterceptor {
private StringRedisTemplate stringRedisTemplate;
    public LoginIntercepter(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;

    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)) {
            response.setStatus(401);//未授权
            return false;
        }
        Map<Object, Object> map = stringRedisTemplate.opsForHash().entries(LOGIN_USER_KEY + token);
        if (map.isEmpty()) {
            response.setStatus(401);//未授权
            return false;
        }
        //将hash转回userdto
        UserDTO user = BeanUtil.mapToBean(map, UserDTO.class, true);

        //用户信息存入ThreadLocal
        UserHolder.saveUser((UserDTO) user);
        stringRedisTemplate.expire(LOGIN_USER_KEY + token, LOGIN_USER_TTL, TimeUnit.MINUTES);
        //放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
       UserHolder.removeUser();
    }
}
